1、 _ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this
3、publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J1549_201509 SURFACE VEHICLE RECOMMENDED PRACTICE J1549 SEP2015 Issued 1988-04 R
5、eaffirmed 2015-09 Superseding J1549 APR1988 Diesel Fuel Injection Pump - Validation of Calibrating Nozzle Holder Assemblies RATIONALE J1549 has been reaffirmed to comply with the SAE five-year review policy. 1. ScopeThe fuel injection pump is intended to validate the accuracy of calibrating nozzle a
6、nd holderassemblies for applications using 0.4 - 0.8 mm diameter orifice plates and to assist in identifying problems infuel injection pump test stands.This SAE Recommended Practice is divided into two parts:Part IDesign, Description and Specifications of the Fuel Injection Pump; andPart IITest Proc
7、edures for Using the Fuel Injection Pump.2. References2.1 Applicable PublicationsThe following publications form a part of this specification to the extent specifiedherein. Unless otherwise specified, the latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATIONSAvailable from SAE, 400 Comm
8、onwealth Drive, Warrendale, PA 15096-0001.SAE J968 MAR85Calibrating Nozzle and Holder Assembly for Diesel Fuel Injection SystemsSAE J1418 DEC87Fuel Injection Pumps High Pressure Pipes (Tubing) for Testing2.1.2 ISO PUBLICATIONSAvailable from ANSI, 11 West 42nd Street, New York, NY 10036-8002.ISO4008/
9、1Fuel injection pump testingDynamic conditions (1980-11-15)ISO7440Calibrating nozzle and holder assemblies3. Part 1Design, Description and SpecificationsPart I of this SAE Recommended Practice describes andestablishes specifications and features of a fuel injection pump and its auxiliary equipment r
10、equired to performthe above purpose.3.1 Design and DescriptionThis fuel injection pump shall be a single-cylinder, self-contained and cam-operated. Details as to the manufacturers source are available from SAE. This pump shall provide fueldeliveries and injection pressures capable to test calibratin
11、g nozzle and holding assemblies as listed in Part II.It shall incorporate positive control rack positioning and may have preset stops corresponding to a specifieddelivery for each orifice size of calibrating nozzle holders.3.2 Pump SpecificationsThe fuel injection pump described here shall incorpora
12、te the following features:3.2.1 DELIVERY VALVE9 mm dia75 mm3 retraction volumeLower seated3.2.2 DELIVERY VALVE SPRING0.9 mm wire dia4.8 mm spring O.D.Total number of coils18Number of effective coils16Free length26.2 mmEnds square and ground3.2.3 DELIVERY VALVE HOLDER14 x 1.5 mm thread, 60 deg cone s
13、eat for injection tubing 3.2.4 SUPPLY PUMPPlunger dia 22 mmStroke 10 mmDisplacement 3800 mm3/strokeRegulating pressure 2.4 bar(35 lbf/in2) at 60 rpm (full bypass)3.2.5 PLUNGER AND BARREL ASSEMBLY11 mm diameter, left-hand lower helix, 24 mm leadLift to Port Closure: 3 mmNumber of Ports: 2Size of Port
14、s: 3 mm3.2.6 CAM TYPE, PROFILETangential typeMaximum velocity 1.94 m/s 1000 rpm, 10 mm lift3.2.7 TAPPET ASSEMBLYRoller dia 25 mm_ SAE INTERNATIONAL J1549 SEP2015 2 of 53.2.8 OVERFLOW VALVEFor system operating pressures 1.2 to 1.3 bar (17 to 19 lbf/in2) 1000rpm3.2.9 DRIVE COUPLINGBacklash free, to ma
15、te with test stand coupling and approved by the test stand manufacturer.3.2.10 AUXILIARY EQUIPMENT3.2.11 FUEL F ILTERFinal stage to be plumbed between supply pump and pump gallery. Filter efficiency details can beobtained from SAE.3.2.12 PRESSURE MEASUREMENTS0 to 2 bar (0 to 30 lbf/in2), ANSI B 40.1
16、-1985 Grade A, measurement downstream of pump mounted finalstage filter, adequately snubbed to prevent damage from severe pulsations.3.2.13 CALIBRATION F LUID TEMPERATURE M EASUREMENTSMust be capable of measuring calibration fluidtemperature prior to entry into the gallery at 40 C with an accuracy o
17、f 0.5 C.4. Part IITest Conditions and ProcedurePart II of this SAE Recommended Practice is intended toestablish conditions and procedures for flow testing calibrating nozzle and holder assemblies in order to verifytheir flow accuracy.For the purposes of these tests, two types of calibrating nozzle a
18、nd holder assemblies are defined as follows:a. “Working“ type are those in continuous use for calibrating and testing pumps.b. “Reference” type are those with deliveries within the mean flow band of the manufacturers limits, withhigher than average repeatability and used only for reference.The objec
19、tive of these tests is to compare deliveries of “working“ types to “reference“ calibrating nozzle andholder assemblies at pump preset deliveries under identical test conditions. Working and reference calibratingnozzle and holder assemblies must be of the same design and specifications.NOTEBefore flo
20、w tests are initiated, make certain that “working“ type calibrating nozzle and holder assemblyleak tests and valve opening pressures meet SAE J968.4.1 General Checking and testing calibrating nozzle and holder assemblies is accomplished most effectively bydynamically flow testing them. The tests des
21、cribed below shall be accomplished on a test stand with thefollowing features:Power3.7 kW (5 HP) minimumTachometerDigital, accuracy 1 digit, update 1 s maximumMoment of Inertia0.127 kgm2 minimum1Speed Stability1 rpm at 1000 rpm for 1 min duration, minimum.1. Per ISO 4008/I assuming: Max delivery: 26
22、0 mm3/str.Peak InjectionPressure: 641 bar (9300 lbf/in2)Pump Speed: 1000 rpm_ SAE INTERNATIONAL J1549 SEP2015 3 of 5In addition, the measuring system must be repeatable and checked prior to the start of these tests.The calibrating nozzle and holder assemblies that are intended to be tested using thi
23、s fuel injection pump aredescribed in SAE J968.4.2 Test ConditionsThe following general guidelines and conditions shall be adhered to during the tests:Calibration FluidSAE J967Calibration Fluid Temperature40 C 0.5 C (104 F 1 F) measured at fuel gallery inletCalibration Fluid Pressure1.2 to 1.3 bar (
24、17 to 19 lbf/in2) at fuel gallery inletDrive CouplingBacklash freeHigh Pressure Tubing6.35 mm (1/4 in) O.D. x 1.6 mm (0.062 in) I.D. x 600 mm (23.6 in) long (SAEJ1418)Settling Time230 s and consistent for each drawDrain Time2 20 to 30 s and consistent for each draw4.3 Test ProcedureTo test a set of
25、“working” calibrating nozzle and holder assemblies (or a single assembly),proceed as follows:4.3.1 Connect a “reference” calibrating nozzle and holder assembly to the injection pump described in Part I usinghigh pressure tubing size as per this recommended practice.4.3.2 Run pump at 1000 rpm for a m
26、inimum of 20 min to stabilize the system and achieve specified calibration fluidtemperature.4.3.3 Select control rack stop to achieve the approximate delivery per the table.4.3.4 Take two draws, but do not record.4.3.5 Take three consecutive draws with equal drain time. After settling time, record e
27、ach reading. If readings arewithin 1 cc of each other, calculate the average and record.NOTEIf readings are not repeatable, check test stand systems, pump and nozzle holder and correctproblem before proceeding.4.3.6 Remove “reference” calibrating nozzle and holder assembly and install a “working” un
28、it of the same orificesize. DO NOT MOVE CONTROL RACK.4.3.7 Repeat Step 2 (paragraph 4.3.2) for a minimum of 5 min to stabilize the temperature of the “working”calibrating nozzle and holder assembly.4.3.8 Repeat Steps 4 and 5 (paragraphs 4.3.4 and 4.3.5).4.3.9 Readings obtained with a “working” nozzl
29、e holder must be within 3% of the reading of the “reference”calibrating nozzle and holder assembly and within a 2% band in a set.4.3.10 If a calibrating nozzle and holder assembly is found to be defective, replace with new or repair according tomanufacturers instructions.For each calibrating nozzle
30、and holder assembly, set control rack to achieve approximate delivery per Table1. The recommended number of strokes should be according to the test stand manufacturers instructions.In the absence of specific instructions, fill graduates to a minimum of 50% of their capacity2.2. If graduates are used._ SAE INTERNATIONAL J1549 SEP2015 4 of 5PREPARED BY THE SAE DIESEL FUEL INJECTION EQUIPMENT STANDARDS COMMITTEETABLE 1OrificeDiameterApproximate Fuel Deliverycc/1000 str0.40.50.60.70.870110160215250_ SAE INTERNATIONAL J1549 SEP2015 5 of 5
